/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.execution.operator.schema;

import org.apache.iotdb.commons.exception.MetadataException;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.metadata.plan.schemaregion.impl.read.SchemaRegionReadPlanFactory;
import org.apache.iotdb.db.metadata.plan.schemaregion.result.ShowDevicesResult;
import org.apache.iotdb.db.mpp.common.header.ColumnHeader;
import org.apache.iotdb.db.mpp.common.header.ColumnHeaderConstant;
import org.apache.iotdb.db.mpp.execution.driver.SchemaDriverContext;
import org.apache.iotdb.db.mpp.execution.operator.OperatorContext;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;
import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder;
import org.apache.iotdb.tsfile.utils.Binary;

import java.util.List;
import java.util.stream.Collectors;

public class DevicesSchemaScanOperator extends SchemaQueryScanOperator {
    private final boolean hasSgCol;
    private final List<TSDataType> outputDataTypes;

    public DevicesSchemaScanOperator(
            PlanNodeId sourceId,
            OperatorContext operatorContext,
            int limit,
            int offset,
            PartialPath partialPath,
            boolean isPrefixPath,
            boolean hasSgCol) {
        super(sourceId, operatorContext, limit, offset, partialPath, isPrefixPath);
        this.hasSgCol = hasSgCol;
        this.outputDataTypes =
                (hasSgCol
                        ? ColumnHeaderConstant.showDevicesWithSgColumnHeaders
                        : ColumnHeaderConstant.showDevicesColumnHeaders)
                        .stream().map(ColumnHeader::getColumnType).collect(Collectors.toList());
    }

    @Override
    protected List<TsBlock> createTsBlockList() {
        try {
            List<ShowDevicesResult> schemaRegionResult =
                    ((SchemaDriverContext) operatorContext.getInstanceContext().getDriverContext())
                            .getSchemaRegion()
                            .getMatchedDevices(
                                    SchemaRegionReadPlanFactory.getShowDevicesPlan(
                                            partialPath, limit, offset, hasSgCol, false))
                            .left;
            return SchemaTsBlockUtil.transferSchemaResultToTsBlockList(
                    schemaRegionResult.iterator(), outputDataTypes, this::setColumns);
        } catch (MetadataException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    private void setColumns(ShowDevicesResult device, TsBlockBuilder builder) {
        builder.getTimeColumnBuilder().writeLong(0L);
        builder.getColumnBuilder(0).writeBinary(new Binary(device.getPath()));
        if (hasSgCol) {
            builder.getColumnBuilder(1).writeBinary(new Binary(device.getDatabase()));
            builder.getColumnBuilder(2).writeBinary(new Binary(String.valueOf(device.isAligned())));
        } else {
            builder.getColumnBuilder(1).writeBinary(new Binary(String.valueOf(device.isAligned())));
        }
        builder.declarePosition();
    }
}
